A1Z26 Cipher
Convert letters to numbers and back again using A = 1 through Z = 26.
Input
Output
Using This Tool: Guide & Notes Show guide
A1Z26 maps letters to alphabet positions: A = 1, B = 2, through Z = 26.
How to use it
- Choose Encode to turn letters into numbers, or Decode to turn numbers back into letters.
- Paste text or number groups into the input box.
- Check separators carefully when decoding.
- Copy the output once the number format matches what you need.
Options and settings
- Separator settings control how numbers are divided in encoded output.
- Preserve unsupported characters keeps spaces, punctuation, and digits visible.
- Decode mode expects clear number boundaries so 1 2 and 12 are not confused.
- Grouping can make long encoded messages easier to read.
Notes
- A1Z26 is a simple representation of alphabet position, not secure encryption.
- Ambiguous separators are the most common cause of bad decoding.
Related Article
A1Z26 Cipher: The Mechanics of Simple Substitution
How replacing letters with their alphabet positions teaches symbolic transformation, reversibility, and the limits of simple secrecy.